MARK Wahlberg was shocked to find out he was being paid 99 per cent more than his female co-star.

Mark Wahlberg has pledged to give his $1.5m movie fee to the Time's Up campaign [Getty]

The father-of-four is gifting $1.5 million of his pay for the 2017 crime thriller All The Money in the World, to Hollywood's Time's Up campaign.

The star decided to give up his fee for filming reshoots of a number of scenes after it was discovered his co-star Michelle Williams was paid just one per cent of his asking price to finish the movie.

After a public outcry, Mark announced his plan to donate his fee to the Times Up campaign, which will provide legal support to those who have experienced sexual harassment, assault, or abuse in the workplace.

Mark Wahlberg (L) and Michelle Williams star in All The Money In The World together [Getty]

He said: "Over the last few days my reshoot fee for All The Money in the World has become an important topic of conversation. I 100 per cent support the fight for fair pay and I'm donating the $1.5 million to the Time's Up Legal Fund in Michelle Williams' name."

Director Sir Ridley Scott asked the actors to return to Europe over Thanksgiving weekend last November to reshoot the essential scenes, after Kevin Spacey was booted off the project following allegations of past sexual misconduct.

And while Williams was paid just $80 a day for the extra work, Wahlberg's team negotiated him a fee of $1.5 million for the reshoots.

Fellow actor Mark Ruffalo was among those to praise Walhberg [Twitter]

The move caused outrage because Williams and Wahlberg are both represented by the same talent agency (WME), but she was reportedly not told about the deal they had struck for her male co-star.

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WME has also pledged $500,000, saying in a statement: "The current conversation is a reminder that those of us in a position of influence have a responsibility to challenge inequities, including the gender wage gap.

Mark Wahlberg, Charlie Plummer, Michelle Williams, and Ridley Scott attend the premiere of Sony Pictures Entertainment's All The Money In The World [Getty]

"In recognition of the pay discrepancy on All The Money In The World reshoots, WME is donating an additional $500,000 to the Time's Up Legal Fund in Michelle Williams' name, following our $1 million pledge to the organization earlier this month.

"It's crucial that this conversation continues within our community and we are committed to being part of the solution."